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https://issues.apache.org/jira/browse/NIFI-1877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15363021#comment-15363021
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ASF subversion and git services commented on NIFI-1877:
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Commit 32b8a9b9f4c07b4f5d3049c33880b547481cbb24 in nifi's branch 
refs/heads/master from [~markap14]
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=32b8a9b ]

NIFI-1877, NIFI-1306: Add fields to FlowFile for FIFO Prioritizer, 
Oldest/Newest FlowFile first prioritizers to work properly

This closes #546


> FirstInFirstOut prioritizer does not work.
> ------------------------------------------
>
>                 Key: NIFI-1877
>                 URL: https://issues.apache.org/jira/browse/NIFI-1877
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 0.6.1
>            Reporter: Matthew Clarke
>            Assignee: Mark Payne
>             Fix For: 1.0.0
>
>
> The FirstInFirstOut (FIFO) prioritizer has no guarantee of actually working 
> on queued FlowFile in a FIFO order.  The reliance on lastQueuedDate or time 
> is not sufficient to guarantee order as FlowFile processed as batched will 
> all have the same exact timestamp.  There is also inconsistency in how 
> processors update lastQueuedDate. If a processor passes a FlowFile through 
> without any change, Date is not updated.  This in turn affects the processing 
> order of FlowFiles. We are finding that more and more NiFI users have 
> specific file processing order needs.



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